
HackerRank
Codility
LeetCode
HackerEarth
Coderbyte
DevSkiller
iMocha
CodeSignal is the leading assessment platform for technical hiring.

Snapchat
Instagram
BeReal
TikTok
WhatsApp
X (Twitter)
NVSTly
Native iOS AI-powered teen social & time-sensitive messaging app. Timer starts on send — not when they open it. Secret Drops, Backroom, Smart Camera to handle messages & switching all media types & AI Remix for prompt-based photo & video remix.

Which is more popular?
Based on our record, CodeSignal seems to be more popular. It has been mentioned 27 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | codesignal.dev | locksy.app |
| Pricing | — | |
| Company | — | Startup from the United States · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of CodeSignal yet.
Locksy is a native iOS, AI-powered teen social and messaging platform redefining how Gen Z connects, communicates, and creates. Built around a proprietary dual-sided countdown mechanic — the only app in the market where the timer starts the moment content is sent, not when the recipient opens it...
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
CodeSignal Talent Stories: Marcus Currie + Evernote
More videos
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing CodeSignal and Locksy.
Locksy's answer:
Locksy is the only app where the countdown starts the moment content is sent — not when the recipient opens it. This dual-sided, send-triggered countdown mechanic runs simultaneously for both sender and recipient, creating a live shared event that vanishes forever if not unlocked in time. No other social or messaging app has shipped this mechanic. Combined with a single-tap multimedia switching Smart Camera, private ephemeral Backroom rooms, a dynamic school discovery system, and Locksy AI Remix — a native prompt-based photo and video transformation layer built directly into the Drop flow — Locksy represents a fundamentally different architecture for teen social communication.
Locksy's answer:
Most social apps are built for permanence — feeds, archives, and content that lives forever. Locksy is built for moments. Unlike Snapchat, Instagram, or BeReal, Locksy's timer starts the second content is sent rather than when it is opened, making every message a live, urgent, shared experience rather than a passive notification. Friends don't need the app to receive a Secret Drop. Backroom spaces are themselves ephemeral — the room vanishes, not just the content. And Locksy AI Remix transforms any photo or video clip with a free-text prompt natively inside the Drop flow, with no preset filters or templates. Locksy is free always, available exclusively in the United States, and built natively on iOS.
Locksy's answer:
Locksy's primary audience is Gen Z teens aged 13 to 18 in the United States. The platform is specifically designed for the generation that has grown up on social media and is actively moving away from public feeds, permanent content, and performative posting toward private, intimate, real-time communication with close friends. Locksy's school discovery system allows users to find and connect with their real-world circle by school, grade, and class, reinforcing its focus on genuine peer connection rather than follower counts or public audiences.
Locksy's answer:
Locksy was built on a single observation: the foundational mechanic of every major social app — the timer starting when someone opens a message — creates the illusion of urgency without the reality of it. Locksy's founders set out to fix the actual mechanic. By starting the countdown the moment content is sent, running simultaneously for both sides regardless of when the recipient opens the app, Locksy turns every message into a genuinely live, shared event. Built natively in Swift by a powerhouse team headquartered in the heart of Silicon Valley, Locksy launched exclusively in the United States and has since shipped Secret Drops, Backroom ephemeral rooms, the Locksy Smart Camera, and Locksy AI Remix — the first native AI creative layer built directly into a social app's core Drop flow.
Locksy's answer:
Locksy is built natively in Swift using Xcode, running exclusively on iOS and leveraging Apple's native frameworks throughout. The platform is engineered for speed — every component of the experience, including Locksy AI Remix, is designed to operate fast enough to keep pace with a live countdown mechanic. Locksy AI Remix supports both photo and video clip transformation through a free-text prompt interface, with no preset filters or templates required. Voice prompt input is also supported, allowing users to describe their transformation by speaking rather than typing.
Locksy's answer:
Locksy's primary users are teenagers aged 13 to 18 across the United States, with particular traction among high school students who use the platform to communicate within their existing real-world social circles. The school discovery system allows students to connect by school, grade, and class, meaning Locksy's user base is naturally organized around real institutions rather than algorithmic networks. As a consumer social platform, Locksy does not publish individual user or institutional data.
Share your experience with using CodeSignal and Locksy. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


CodeSignal is a technical interview and assessment solution that helps organizations identify quality candidates quickly. Our platform allows recruiters and hiring managers to design consistent and well-researched...
What are LeetCode and LeetCode alternatives good for?LeetCode💡Interested in leveling up your career? Apply to the Formation Fellowship...
CodeSignal is renowned for its standardized coding assessments and a robust IDE. It's an excellent platform for interview preparation and improving coding skills through timed challenges.
One of the few apps that actually feels thoughtfully designed instead of feature-packed.
Locksy solves a problem every teen feels but nobody had fixed — the moment you send something, the clock should already be ticking for both of you, not just when they decide to open it. That single mechanic changes...
Recommendations tracked on public social media and blogs since March 2021.


Mention tools like Slack, Zoom, GitHub Highlight remote work experience or team collaboration Link to your portfolio and GitHub Prepare for video interviews and live coding sessions (HackerRank, CodeSignal, etc.). - Source: dev.to / about 1 year ago
When I started, I programmed many different things in different languages. Then, I found a job as a Junior Java Developer and solved tasks on CodeSignal every day. - Source: dev.to / over 1 year ago
Platforms like HackerRank and CodeSignal host challenges that not only hone your skills but also can put you on the radar of tech companies looking for talent. - Source: dev.to / over 2 years ago
Tracking Locksy since Jul 2026.
When comparing CodeSignal and Locksy, you can also consider the following products.

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Practice and level up your development skills and prepare for technical interviews.
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Everyday at a different time, everyone is notified simultaneously to capture and share a Photo in 2 Minutes.
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